From: Srivatsa Vaddagiri <vatsa@in.ibm.com>
To: Gautham R Shenoy <ego@in.ibm.com>
Cc: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Rusty Russell <rusty@rustcorp.com.au>,
Zwane Mwaikambo <zwane@arm.linux.org.uk>,
Nathan Lynch <nathanl@austin.ibm.com>,
Joel Schopp <jschopp@austin.ibm.com>,
Ashok Raj <ashok.raj@intel.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>
Subject: Re: [BUG] cpu-hotplug: Can't offline the CPU with naughty realtime processes
Date: Mon, 7 May 2007 16:32:56 +0530 [thread overview]
Message-ID: <20070507110256.GM7311@in.ibm.com> (raw)
In-Reply-To: <20070507104724.GA10624@in.ibm.com>
On Mon, May 07, 2007 at 04:17:24PM +0530, Gautham R Shenoy wrote:
> Nevertheless, with the freezer based approach that we're experimenting,
> this problem shouldn't arise. We expect the whole system to get frozen
> before we actually do a cpu_down() (which will then call
> __stop_machine_run). So any such rogue RT task will have to first fail
> the freezer ( which it will),
>From what I understand of the freezer, if the RT task is running in user
space (which seems to be the case in this thread), it should get frozen even
if it is a forever running SCHED_FIFO task at MAX_RT_PRIO -1 priority?
> but that's ok, since on a freezer-fail,
> we just thaw all the processes and get the system up and running again.
> Yeah, the cpu-hotplug operation will fail though.
--
Regards,
vatsa
next prev parent reply other threads:[~2007-05-07 10:54 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-07 10:10 [BUG] cpu-hotplug: Can't offline the CPU with naughty realtime processes Satoru Takeuchi
2007-05-07 10:47 ` Gautham R Shenoy
2007-05-07 11:02 ` Srivatsa Vaddagiri [this message]
2007-05-07 12:39 ` Gautham R Shenoy
2007-05-07 10:55 ` Srivatsa Vaddagiri
2007-05-07 10:56 ` KAMEZAWA Hiroyuki
2007-05-07 13:42 ` Rusty Russell
2007-05-08 2:41 ` Satoru Takeuchi
2007-05-08 3:02 ` Rusty Russell
2007-05-08 3:29 ` Satoru Takeuchi
2007-05-08 4:04 ` Rusty Russell
2007-05-08 4:10 ` Srivatsa Vaddagiri
2007-05-08 7:16 ` Satoru Takeuchi
2007-05-08 16:48 ` Srivatsa Vaddagiri
2007-05-09 0:40 ` Satoru Takeuchi
2007-05-09 0:47 ` Nick Piggin
2007-05-09 6:31 ` Satoru Takeuchi
2007-05-09 8:56 ` Gautham R Shenoy
2007-05-11 8:49 ` [PATCH 1/2] Fix stop_machine_run problem with naughty real time process Satoru Takeuchi
2007-05-11 9:18 ` Satoru Takeuchi
2007-05-11 8:49 ` [PATCH 2/2] cpu hotplug: fix ksoftirqd termination on cpu hotplug with naughty realtime process Satoru Takeuchi
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20070507110256.GM7311@in.ibm.com \
--to=vatsa@in.ibm.com \
--cc=ashok.raj@intel.com \
--cc=ego@in.ibm.com \
--cc=heiko.carstens@de.ibm.com \
--cc=jschopp@austin.ibm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=nathanl@austin.ibm.com \
--cc=rusty@rustcorp.com.au \
--cc=takeuchi_satoru@jp.fujitsu.com \
--cc=zwane@arm.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox